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I was searching for lightweight collaboration suite (messaging and groupware) to manage some small websites and while searching around I found Citadel.

Citadel is a complete and feature-rich open source groupware platform.

Email, calendaring/scheduling, address books

Bulletin boards, mailing list server, instant messaging

Multiple domain support

An intuitive, attractive AJAX-style web interface

The Citadel system is extremely versatile. It provides numerous front ends to present to users, such as a text-based interface, an AJAX-style web interface, and many popular PIM clients using SMTP/POP/IMAP. All of these can be used simultaneously.

It’s also extremely scalable. Not only can a well-equipped Citadel server support a large number of concurrent users, but you can also build a distributed network of Citadel nodes that share rooms and their content.

Let’s see how to install and configure it on a Debian 7 “wheezy”, most of this guide it’s based on the great linode guide wrote for debian 6.Continue reading »

Since its initial introduction into the business world in 2005, Google Apps has been available to small business users for free. Even when the premium version was launched in 2007, Google still maintained a free standard version for individuals and small organizations, this was great for small website, they could have their emails managed by the Big G.

For Businesses, instead of two versions, there will be one. Companies of all sizes will sign up for our premium version, Google Apps for Business, which includes 24/7 phone support for any issue, a 25GB inbox, and a 99.9% uptime guarantee with no scheduled downtime. Pricing is still $50 per user, per year.

This is not doable for small websites that have their own domain but don’t need this service for 50$, so a good solution in these cases is to set up on your VPS a postfix server that can forward all the emails to another email.

For a customer i was in need of a quick way to send an email every time his system (centos) stop, reboot or simply boot.
I’ve found an useful article http://www.syntaxtechnology.com and most of this article is based on that.

To get an email at both start up and shut down we need to write an init script. The tips below are specific to a Red Hat based system (Red Hat, Fedora, CentOS, etc) but should be fairly similar to others, depending on the boot system you’ll have to change slightly the script.Continue reading »

A bit old, but still really useful, i used this method on a server. Article by Tom, first posted on Tombuntu Wouldn’t it be useful if your computer could email you? I’d like to be notified by email when my server is in trouble, but I don’t want to run my own mail server. sSMTP […]

Or email safely Original article by Maurizio Antonelli As well as documentation for those interested, I sincerely hope that it can raise awareness of the non-security of “electronic mail” and help users to take the appropriate implementation tools. Let’s start with this basic idea: “Email is not a secure media for transmitting information.” In fact, […]